Patents by Inventor James L. Zak

James L. Zak has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Method of packaging aqueous slurries
    Patent number: 5323588
    Abstract: Ready-mix joint compound packaged in a container, the inner surface of which has a thin coating of humectant, such as a glycol, maintaining an improved uniformity of the moisture content of all portions of the ready-mix joint compound contained therein.
    Type: Grant
    Filed: October 22, 1992
    Date of Patent: June 28, 1994
    Assignee: National Gypsum Company
    Inventors: James L. Zak, Richard E. Smith
  • Humectants in joint compound containers
    Patent number: 5183152
    Abstract: Ready-mix joint compound packaged in a container, the inner surface of which has a thin coating of humectant, such as a glycol, maintaining an improved uniformity of the moisture content of all portions of the ready-mix joint compound contained therein.
    Type: Grant
    Filed: September 4, 1990
    Date of Patent: February 2, 1993
    Assignee: National Gypsum Company
    Inventors: James L. Zak, Richard E. Smith